[optim] Optimized some World methods by using getChunkIfExists instead of chunkExists + getChunkFromChunkCoords

[optim] Optimized RegionFileCache - don't clear full cache on overflow - remove only oldest (by usage) entries ...

Also fixed possible deadlock

Update player chunk send queue on server coord changes (don't await client packet) ...

1. It is an optimization because we don't rebuilding chunk list on each player packet
2. It is an improvement because we don't awaiting client packet on player server coord change (like teleportation)
3. It is a fix because some client mods don't send coord update packet to server before first chu packet handling

Disable entity updating in worlds with disabled chunk loaders and no players ...

(previously 'enableChunkLoaders' option was ignored in this context)

Fixed Entity & TileEntity unloading in worlds with 0 active chunks (memory leak on world generation)

[compat] Fixed EntityLimiter & mob spawn for LycanitesMobs

Fixed kick from server if player with too long username connected

[optim] Optimized Chunk.scheduleBlockUpdate() ...

- use ShortObjMap with chunk coord keys instead of HashSet<PendingBlockUpdate>
  - deduplicate PendingBlockUpdate by coord
  - pool ShortObjMap and TreeSet objects

[optim] Little WorldServer.func_147456_g() optimizations (it is enough hot) ...

- removed unused variables
  - use ThreadLocalRandom instead of default world Random

[optim] Optimized World.getBlockIfExists()

[optim] Fixed Entity with old AI path recounting each tick if target is not reachable

[optim] Use buffered IO when writing non-compressed NBT to file

Fixed player renderDistance reset after death

Fixed possible crashes caused by wrong eventProxy.startEntity(entity) placement

Fixed player lang reset after death

[optim] Optimized vanilla leaves decay

[optim] Totally replaced LongHashMap & IntHashMap implementation to Koloboke collections

Fixed invisible players after teleportation

Throw IllegalArgumentException from DataWatcher if object id < 0 (fix for thaumicenergistics)

[optim] ImportChunkLoader disposing ...

Now we don't wait for finishing of writing all worlds. Waiting only for current world, then closing region files. Currently implemented for ImportChunkLoader only, should be implemented for default chunk loader in future

Fixed 10bec8e13a PendingBlockUpdates and EntityFallingBlock processing after chunk populating

Creating Entity UUID via ThreadLocalRandom

Revert "[optim] Entity.random replaced to ThreadLocalRandom (it's really faster)" ...

This reverts commit 3aa3ad9.
(Issues with some mods that uses random seed)

[optim] vanilla PlayerProfileCache ...

Do not rewrite json file if cache not changed, write it async

I18n for duration format & restart messages

More appropriate behavior of not splitted world mode (splitWorldDirs: false)

Exclude dead entities from of Chunk.getEntitiesWithinAABBForEntity & Chunk.getEntitiesOfTypeWithinAAAB

[optim] Entity.random replaced to ThreadLocalRandom (it's really faster)

[optim] Entity & TileEntity removal - do not call ArrayList.removeAll if no entities to remove

[optim] DataWatcher.watchedObjects type replaced from TIntObjectHashMap to fixed-size array ...

It is both CPU and memory optimization. Maximum index - 31, so array size is 32. It less than usual has table in TIntObjectHashMap